whoa dudes.. if yall are even thinkin' about a turbo conversion then there's tons of work to be done, starting off with an ecu, new headers/manifolds, new combustion chamber lay-out, blue printing the lower block, new seals, new exhaust for a lower compression, new internals for a lower compression, you'll need to re-build your engine bay to be able to hold all the new parts and accessories.
new accessories consist of:
blow off valve
new cold air intake
... all that just for a small 50hp upgrade..?
if i was you i'd be lookin' for a supercharger for the engine.. what ever it may be.. h22/h23/b18... anyway... still.. if i was you i'd be doin' an engine transplant with a b18c5 and then building it for a high compression and high torque... i've heard rumors that a b18c5 w/o forced induction.. is capable of around 320hp... maybe more.. maybe less..
If i still owned an excel.. It'd look like this: